Calculating Binomial Probabilities; Press Exe; Continued On Next Page - Casio fx-9860GII Instructions Manual

5.12 Calculating binomial probabilities

Example 52
X is a discrete random variable and X ~ Bin(9, 0.75).
Calculate P(X = 5)
⎛ ⎞
9
( )
P X = =
5
5 0 75 0 25 . .
⎝ ⎜ ⎠ ⎟
5
The calculator can fi nd this value directly.
Press MENU . You will see the dialog box as shown on the right.
Choose 2: STAT and press
F5 F5
Press DIST | BINM |
Enter the x-value 5, the number of trials, 9 and the probability 0.75.
Press EXE .
The calculator shows that P (X = 5) = 0.117 (to 3 sf ).
Example 53
X is a discrete random variable and X ~ Bin(7, 0.3).
Calculate the probabilities that X takes the values {0, 1, 2, 3, 4, 5, 6, 7}.
MENU
Press . You will see the dialog box as shown on the right.
Choose 2: STAT and press
F5 F5
Press DIST | BINM |
© Oxford University Press 2012: this may be reproduced for class use solely for the purchaser's institute
4
EXE .
F1
Bpd.
EXE
.
F1 Bpd.
Casio fx-9860GII
{

Continued on next page

Using a graphic display calculator 47